HIGH STRENGTH STEEL PLATE WITH HIGH DYNAMIC DEFORMATION RESISTANCE, AND ITS PRODUCTION

Japanese Patent JP3619357

B2

PROBLEM TO BE SOLVED: To provide a high strength steel plate exhibiting high impact energy absorptivity at the time of collision of a front side member, etc., and its production.
SOLUTION: In the high strength steel plate having high dynamic deformation resistance, the steel plate as a final product has a structure composed of a microstructure which contains ferrite and bainite and where either of them is used as a principal phase and they form a conjugated structure together with a third phase containing retained austenite by 3-50% by volume fraction. Further, in this steel plate, the average value σdyn (Mpa) of deformation stress at 3-10% equivalent strain at the time when predeformation of >0-10% equivalent strain is applied and then deformation is applied at 5×102 to 5×103 (1/s) strain rate satisfies inequality σdyn ≥0.766×TS+250 represented by the maximum stress TS (MPa) at the static tensile test measured at 5×10-4 to 5×10-3 (1/s) strain rate before predeformation is applied. Moreover, work hardening exponent at 1-5% strain is regulated to ≥0.080.

Osamu Kono
Manabu Takahashi
Akihiro Uenishi

JP36012797A

February 09, 2005

December 26, 1997

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Nippon Steel Corporation

C21D9/46; C22C38/00; C22C38/06; C22C38/58; (IPC1-7): C22C38/00; C21D9/46; C22C38/06; C22C38/58

JP9241788A
JP7207413A
JP8291361A
JP55117504A
JP3530353B2
JP3530354B2
JP3530355B2
JP3530356B2

Takashi Ishida
Takao Mitsui
Toshio Toda
Masaya Nishiyama

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